Towel bar



FIG. 1 is a perspective view of a towel bar showing my new design;

FIG. 2 is a left end view thereof, the opposite end being a mirror image of the end shown;

FIG. 3 is a rear view thereof;

FIG. 4 is a top plan view thereof, the bottom being a mirror image of the side shown; and,

FIG. 5 is a front elevational view thereof.

The broken lines show portions of the design that form no part of the claimed design. 

CLAIM The ornamental design for a towel bar, as shown and described. 